Flexovit A0390 Bisco Tool Supply sells High Performance Grinding Wheels offer High Productivity, Versability, and Durability. A30S - Fast Grind offers Agressive grinding with a good wheel life. Ideal for most metals, including stainless and other hard alloys. An excellent "all purpose" spec. Grinding Discs - USA Abrasives 4"x1/4"x3/8" Flexovit Fast Grind Depressed Center Grinding Disc for Metal, Stainless. Flexovit Industrial Abrasive Discs. Made in the USA by Flexovit High Quality Industrial Abrasive Products. Sold in box quantities of 25.